Improvement in sewing-machines



3 Sheets--Sheet1. D.- M.- SMYTH.

Sewing-Machines. N0, 141,088, I Patentedluly 22,1873.

INS'Y AM PHGTO-LITHDGRAPHIL ca m: (ossomvs ma 058s) I 3 Shgetssheet2.

D. M. SMYTH.

' Sewing-Machines.

No. 141,088. Patentedx-jM152,1813

AM PM) TD-UTHOGRAPHIL on u. x (osaomm's PnacEss) 3Sheets--Sheet3. D. M.SMYTH.

Sewing-Machines. No.141,088. Patentedjuly22,1873.

@cmn ai AM. PHOTO-UTHOGRAPHIC ca.lv.(osBoR/vs'sPRocEss) -g, and cam, 9

UNITED STATES PATENT OFFICE.

DAVID M. SMYTH, OF LYNN, MASSACHUSETTS, ASSIGNOR TO STIOKLER,

ELLIOTT & WILSON, OF NEW YORK, N. Y. I

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 141,088, dated July 22,1873; application filed May 14, 1873.

To all whom it may concern:

Be it known that I, DAVID M. SMYTH, of Lynn, in the county of Essex andState of Massachusetts, have invented an Improvement in Feed-Motions forSewing-Machines, of which the following is a specification:

Several patents have heretofore been granted to me in which devices areshown for making ornamental and zigzag lines of stitching for boots,shoes, &c. In these devices the feeding mechanism was entirely below thebed of the machine, and reference is hereby made to Letters Patent,numbered 119,246, 122,673, 126,844, 126,845, 130,324, and 130,325.

My present invention is for accomplishing the same objects, and relatesto a means for lockin g out of action the lower feed and bringing thesame into action periodically, and in means for giving a lateral stitchor lateral feedby the needle itself 5 and these two movements broughtinto action periodically or alternately produce the zigzag, waving, orother character of stitching, according to the shapes of the camsoperating in the respective mecha-nisms.

-In the drawing, Figure l is a side view of the machine; Fig. 2 isa-front View; Fig. 3 is a horizontal sectional view through theneedle-bar; and Fig. 4 is an inverted plan.

The needle-bar a is reciprocated by any usual mechanism thepressure-foot b is of any desired character; and the shuttle 0, movedbeneath the bed d, is operated by competent mechanism. The feed-bar e isat the end of the lever f, and is operated by avertical shaft, Theseparts, however, are all well known and used in machines already inmarket, and hence do not require a more detailed description. Upon thefeed-bar lever f I connect an arm, h, and introduce a vertical bolt, k,that is operated as hereafter'described. When this bolt k is allowed todescend and pass behind the arm h, as seen in Fig. 4, the spring Icannot draw the lever f toward its actuating-cam, 9,- hence said camwill revolve without operating the feed 6. This bolt, 70,

hence looks out the feeding mechanism when it is allowed to descend, andthen brings into action that feed when the bolt is drawn up.

To operate the bolt 74 I employ a cam, 0, that is revolved by the pawln, oscillating plate r, and link t that receives motion from a pin, 3,that there is in the needle-bar a and projects through a slot in thefront plate of the sewing-machine, and the slot in the link is of such alength that the link is moved sufficiently to cause the pawl 01. to turnthe ratchet-wheel s, cam 0, and parts connected therewith around onetooth at a time. shaping the cam o in the proper manner it will actthrough the arm 20, shaft o, arm '0, and link on upon the bolt 70 tobring the feedbar 6 into action between such stitches as may be desired,and lock it out of action between other stitches. Adjacent to the cam 0is a second cam, 5, that acts against a block, 6, that is insertedwithin the front plate of the machine and projects through the same intothe path of this cam 5, and it is preferable that this block projectfrom a loop through which the needle-bar passes, as shown, and thisblock 6 is made to spring back and forth and follow the undulations ofthe cam, and

the needle-bar is mounted so as to allow of its swinging, as moved bythis block, and hence the needle is moved at right angles to the feedmotion from the'bar c. When the block 6 is moved back the needle isswung into a different position, and the stitch will not be in the usualline, but at right angles thereto, and by arranging to bring into actionthe lateral movement of the needle when the usual feed motion is lockedout of action, and

r, pawl a, ratchet s, and link t, connected 1 with the needle-bar andthe arms a and 'v of shaft '0 that actuates the locking-bolt k, incombination with the lever f and feed-bar e, substantially as set forth.

Signed this 22d day of April, A. D. 1873.

. D. M. SMYTH.

Witnesses S. A. DANIELS, EDWARD ARNOLD.

